1 #---------------------------------------------------------------------------- 2 # Macros 3 #---------------------------------------------------------------------------- 4 5 mask = (1 << alignment) - 1 6 7 # Output VALUE as an unaligned pointer-sized quantity. 8 .macro pbyte value 9 .if alignment == 2 10 .4byte \value 11 .else 12 .8byte \value 13 .endif 14 .endm 15 16 17 # Start a new CIE, and emit everything up to the augmentation data. 18 # Use LABEL to mark the start of the entry and AUG as the augmentation 19 # string. 20 .macro start_cie label,aug 21 .section .eh_frame,"aw",@progbits 22 \label: 23 .word 2f-1f # Length 24 1: 25 .word 0 # Identifier 26 .byte 1 # Version 27 .string "\aug" # Augmentation 28 .byte 1 # Code alignment 29 .byte 4 # Data alignment 30 .byte 31 # Return address column 31 .endm 32 33 34 # Create a dummy function of SIZE bytes in SECTION and emit the 35 # first four entries of an FDE for it. 36 .macro start_fde cie,section,size 37 .section \section,"ax",@progbits 38 3: 39 .rept \size / 4 40 nop 41 .endr 42 4: 43 .section .eh_frame,"aw",@progbits 44 .word 2f-1f # Length 45 1: 46 .word .-\cie # CIE offset 47 pbyte 3b # Initial PC 48 pbyte 4b-3b # Size of code 49 .endm 50 51 52 # Finish a CIE or FDE entry. 53 .macro end_entry 54 .p2align alignment,fill 55 2: 56 .endm 57 58 59 # Start the augmentation data for a CIE that has a 'P' entry 60 # followed by EXTRA bytes. AUGLEN is the length of augmentation 61 # string (including zero terminator), ENCODING is the encoding to 62 # use for the personality routine and VALUE is the value it 63 # should have. 64 .macro persaug auglen,extra,encoding,value 65 .if (\encoding & 0xf0) == 0x50 66 .byte (-(9 + \auglen + 3 + 2) & mask) + 2 + mask + \extra 67 .byte \encoding 68 .fill -(9 + \auglen + 3 + 2) & mask,1,0 69 .else 70 .byte 2 + mask + \extra 71 .byte \encoding 72 .endif 73 pbyte \value 74 .endm 75 76 77 .macro cie_basic label 78 start_cie \label,"" 79 end_entry 80 .endm 81 82 .macro fde_basic cie,section,size 83 start_fde \cie,\section,\size 84 end_entry 85 .endm 86 87 88 .macro cie_zP label,encoding,value 89 start_cie \label,"zP" 90 persaug 3,0,\encoding,\value 91 end_entry 92 .endm 93 94 .macro fde_zP cie,section,size 95 start_fde \cie,\section,\size 96 .byte 0 # Augmentation length 97 end_entry 98 .endm 99 100 101 .macro cie_zPR label,encoding,value 102 start_cie \label,"zPR" 103 persaug 4,1,\encoding,\value 104 .byte 0 # FDE enconding 105 end_entry 106 .endm 107 108 .macro fde_zPR cie,section,size 109 start_fde \cie,\section,\size 110 .byte 0 # Augmentation length 111 end_entry 112 .endm 113 114 #---------------------------------------------------------------------------- 115 # Test code 116 #---------------------------------------------------------------------------- 117 118 cie_basic basic1 119 fde_basic basic1,.text,0x10 120 fde_basic basic1,.text,0x20 121 122 cie_basic basic2 123 fde_basic basic2,.text,0x30 124 125 cie_basic basic3 126 fde_basic basic3,.text,0x40 127 128 cie_basic basic4 129 fde_basic basic4,.text,0x50 130 131 cie_zP zP_unalign1,0x00,foo 132 fde_zP zP_unalign1,.text,0x10 133 fde_zP zP_unalign1,.text,0x20 134 135 cie_zP zP_align1,0x50,foo 136 fde_zP zP_align1,.text,0x10 137 fde_zP zP_align1,.text,0x20 138 139 cie_zPR zPR1,0x00,foo 140 fde_zPR zPR1,.text,0x10 141 fde_zPR zPR1,.discard,0x20 142 143 cie_zPR zPR2,0x00,foo 144 fde_zPR zPR2,.text,0x30 145 fde_zPR zPR2,.text,0x40 146 147 cie_basic basic5 148 fde_basic basic5,.text,0x10 149 150 .if alignment == 2 151 .section .gcc_compiled_long32 152 .endif 153
